MRP-Principle Inputs for MRP Master production specifies the number of items(end products or Aggregate product plan subassemblies or parts as independent Firm orders Forecast of demand from requirements,usually as repair parts) from known unknown customer customer to be produced during specific time MPS periods; BOM(Bill of material)identifies the specific materials used to make each Bill of MRP Mterials Explosion Inventory item and correct quantities of each; (BOM) Calculus record files The inventory records file supplies data such as the number of units on Production Purchase hand and on order; order order MRP explosion calculus implements the calculation of MRP 上充道大粤
MRP-Principle Aggregate product plan MPS MRP Explosion Calculus Bill of Mterials (BOM) Inventory record files Production order Purchase order Firm orders from known customer Forecast of demand from unknown customer • Inputs for MRP Master production specifies the number of items (end products or subassemblies or parts as independent requirements, usually as repair parts) to be produced during specific time periods; BOM (Bill of material) identifies the specific materials used to make each item and correct quantities of each; The inventory records file supplies data such as the number of units on hand and on order; • MRP explosion calculus implements the calculation of MRP
MRP-Inputs (BOM) BOM contains complete description,listing not only the materials,parts,and components but also the sequence in which the product is created; BOM is often called product structure file or product tree because it show how all the materials,parts,components,and subassemblies are put together to form a product. End item End item level A(2) B(1) Parent level week 2 weeks (level 1) C(1) D(2) C(2) E(3) Child level 2 weeks I week 2 weeks 2 weeks (level 2) Fig 4-4 Typical Product Structure Diagram 上浒充鱼大
MRP-Inputs (BOM) BOM contains complete description, listing not only the materials, parts, and components but also the sequence in which the product is created; BOM is often called product structure file or product tree because it show how all the materials, parts, components, and subassemblies are put together to form a product. Fig 4-4 Typical Product Structure Diagram
MRP-Inputs(BOM) Deferent representations of End item End item level BOM A(2) B(1) Parent level ·Indented part list week 2 weeks (level 1) Single level part list D2) C2) E3) Child level 2 weeks 1 week 2 weeks 2 weeks level 2) Indented Part Lists Single-Level Part Lists End Item End Item A(2) A(2),B(1) C1) A D(2) C(1) B(1) D(2) C(2) B C(2) E3) E3)
MRP-Inputs (BOM) Deferent representations of BOM • Indented part list • Single level part list Indented Part Lists Single-Level Part Lists End Item A(2) C(1) D(2) B(1) C(2) E(3) End Item A(2), B(1) A C(1) D(2) B C(2) E(3)
MRP-Inputs(BOM) Low-level Coding A A B(2) C(3) B(2) C(2) D(1) C(2) D(1) C(3) Although Cs appear at both Level 1 and 2,they should be listed at the lowest level they appear,so that computation may become easier.Why?
MRP-Inputs (BOM) Low-level Coding A B(2) C(3) C(2) D(1) Although Cs appear at both Level 1 and 2, they should be listed at the lowest level they appear, so that computation may become easier. Why? A B(2) C(2) D(1) C(3)
MRP-the Explosion Calculus Example 7.1:the Harmon Music Company,model 85C trumpet: Minimize the amount of money tired with inventory,and production level should be set to match the predicted demand as closed as possible. Valve casting The bell assembly Valve Valve slide Fig 7-4 Trumpet and Subassemblies 上浒充鱼大粤
MRP-the Explosion Calculus Example 7.1: the Harmon Music Company, model 85C trumpet: Minimize the amount of money tired with inventory, and production level should be set to match the predicted demand as closed as possible. Fig 7-4 Trumpet and Subassemblies The bell assembly Valve casting Valve Valve slide